Automating Linux App Startup
|
|
- Geoffrey O’Neal’
- 5 years ago
- Views:
Transcription
1 Automating Linux App Startup David Boyes Sine Nomine Associates Agenda Runlevels, init, and symlinks, oh, my! Sequence of events during startup A sample application startup script Caveats on insserv, yast and friends Q&A (if we have time)
2 Why Do This? Like any other production system, applications need to start at boot time without human intervention. Presentation spawned by a discussion in the Hillgang (and later the Linux-390) mailing list in early October Linux (and Unix) Startup Bootstrap loader for specific HW (stage1) 3card loader Stage 2 loader (grub, zilo, lilo) Kernel (vmunix) Init Runlevel scripts
3 Runlevels 0 = halt 1/S = single user 2 = single user with network 3 = multiuser with network, no graphics 4 = reserved for future use 5 = multiuser with network, graphical 6 = shutdown/reboot 7-9 = reserved for future use init Always process 1 (careful with job control!) Two variations: System V and BSD Linux is System V based Solaris and AIX are SysV FreeBSD can be either (sysvinit package)
4 BSD init /etc/rc.boot /etc/rc.local /etc/rc.<n> Difficult to manage for complex environment Sys V init Mostly compatible at a high level /etc/rc.boot /etc/rc.local New: /etc/init.d/ /etc/init.d/rc<x>.d/
5 Sys V init Startup scripts go in /etc/init.d Symlinks built in /etc/rc<x>.d Snn<scriptname> /etc/init.d/<scriptname> Knn<scriptname> /etc/init.d/<scriptname> Both symlinks point to the same physical file Script called with different arguments to determine function SysV init Scripts executed in numerical order on entry and exit from runlevel: Eg, S01xxx before S02xxx Scripts at same number are executed in alphabetic order (S01able before S01baker, etc) Called with start Kxx scripts called on exit from runlevel Called with stop parameter
6 SysV init SuSE and RH use numbering to force prereq management and startup sequencing Prereq/sequence checking based on magic header in file Automated tools will renumber things caution! Scripts without magic headers are assigned S01 THIS MAY MAKE YOUR SYSTEM UNBOOTABLE! Header #! /bin/sh ### BEGIN INIT INFO # Provides: sshd # Required-Start: $network # Required-Stop: $network # Default-Start: 3 5 # Default-Stop: # Description: Start the sshd daemon ### END INIT INFO. /etc/rc.status. /etc/sysconfig/ssh
7 Script Header, Cont. # Shell functions sourced from /etc/rc.status: # rc_check check and set local and overall rc status # rc_status check and set local and overall rc status # rc_status -v ditto but be verbose in local rc status # rc_status -v -r ditto and clear the local rc status # rc_failed set local and overall rc status to failed # rc_reset clear local rc status (overall remains) # rc_exit exit appropriate to overall rc status # First reset status of this service rc_reset #!/bin/bash # Script Header (RH) # xinetd This starts and stops xinetd. # # chkconfig: # description: xinetd is a powerful replacement for inetd. \ # [ text omitted..] # processname: /usr/sbin/xinetd # config: /etc/sysconfig/network # config: /etc/xinetd.conf # pidfile: /var/run/xinetd.pid PATH=/sbin:/bin:/usr/bin:/usr/sbin # Source function library.. /etc/init.d/functions
8 Samples Start with the working versions in /etc/init.d. man init.d Don t try to manipulate the links manually case "$1" in start) if! test -f /etc/ssh/ssh_host_key ; then echo Generating /etc/ssh/ssh_host_key. ssh-keygen -t rsa1 -b f /etc/ssh/ssh_host_key -N '' fi [. Code omitted ] echo -n "Starting SSH daemon" ## Start daemon with startproc(8). If this fails ## the echo return value is set appropriate. startproc -f /usr/sbin/sshd $SSHD_OPTS # Remember status and be verbose rc_status -v
9 stop) echo -n "Shutting down SSH daemon" ## Stop daemon with killproc(8) and if this fails ## set echo the echo return value. if [ -x /bin/netstat ]; then netstat -nlp 2>/dev/null while read prot a b local remote state pro g; do if [ "${local##*:}" = "22" ] ; then if [ -n "$prog" ]; then kill -TERM ${prog%%/*} fi fi done else rc_failed 1 fi # Remember status and be verbose rc_status -v try-restart) ## Stop the service and if this succeeds (i.e. the ## service was running before), start it again. $0 status >/dev/null && $0 restart # Remember status and be quiet rc_status
10 restart) ## Stop the service and regardless of whether it was ## running or not, start it again. $0 stop $0 start # Remember status and be quiet rc_status force-reload reload) ## Signal the daemon to reload its config. Most daemons ## do this on signal 1 (SIGHUP). echo -n "Reload service sshd" [ code omitted...] rc_status -v
11 status) echo -n "Checking for service sshd: " ## Check status with checkproc(8), if process is running ## checkproc will return with exit status 0. # Status has a slightly different for the status command: # 0 - service running # 1 - service dead, but /var/run/ pid file exists # 2 - service dead, but /var/lock/ lock file exists # 3 - service not running if [ -x /bin/netstat ]; then netstat -nlp 2>/dev/null ( while read prot a b local remote state p rog; do [ code omitted ] fi rc_status -v probe) ## Optional: Probe for the necessity of a reload, ## give out the argument which is required for a reload. test /etc/ssh/sshd_config -nt /var/run/sshd.pid && echo reload
12 *) echo "Usage: $0 {start stop status try-restart restart force-reload relo ad probe}" exit 1 esac rc_exit Linux Tools for Manipulating init insserv chkconfig /etc/sysconfig Not really a tool, but a place to store config info, Bourne shell syntax
13 chkconfig chkconfig -s --set [name state] chkconfig -e --edit [names] chkconfig -c --check name [state] chkconfig -l --list [--deps] [names] chkconfig -a --add [names] chkconfig -d --del [names] Danger, Will Robinson! SLES 7 insserv is BROKEN Make sure your scripts have correct headers! SLES 8 insserv is OK. Works OK in RH Note that comment header is different in RH, but both RH and United Linux headers can be in same file.
14 Q&A Contact Info David Boyes Sine Nomine Associates
15
Automating Linux App Startup
Automating Linux App Startup David Boyes Session L55 2006 Sine Nomine Associates Agenda Runlevels, init, and symlinks, oh, my! Sequence of events during startup A sample application startup script Separating
More informationSupercharged VM Startup: A System V-Style INIT Process for VM and Guests
Supercharged VM Startup: A System V-Style INIT Process for VM and Guests David Boyes Sine Nomine Associates WAVV Colorado Springs 2005 2005 Sine Nomine Associates Presentation Download This presentation
More informationCSE 265: System and Network Administration
CSE 265: System and Network Administration System startup and shutdown Bootstrapping Booting PCs Boot loaders Booting into single user mode Startup scripts Rebooting and shutting down Bootstrapping i.e.,
More informationCSE 265: System and Network Administration
CSE 265: System and Network Administration System startup and shutdown Bootstrapping Booting PCs Boot loaders Booting into single user mode Startup scripts Rebooting and shutting down Bootstrapping i.e.,
More informationBooting Up and Shutting Down. lctseng / Liang-Chi Tseng
Booting Up and Shutting Down lctseng / Liang-Chi Tseng Booting Up Starting up a computer Load kernel into memory and execute it. (1) BIOS load and run the MBR (Master Boot Record) (2) MBR searches for
More informationChapter 2 Booting Up and Shutting Down
Chapter 2 Booting Up and Shutting Down Boot Up? 2 Shut Down? 3 Booting Up Starting up a computer Load kernel into memory and execute it. (1) BIOS load and run the MBR (Master Boot Record) (2) MBR searches
More informationCertification. System Initialization and Services
Certification System Initialization and Services UNIT 3 System Initialization and Services UNIT 3: Objectives Upon completion of this unit the student should be able to: Describe BIOS functions with respect
More informationBooting up and Shutting down A primer for troubleshooting
Booting up and Shutting down A primer for troubleshooting In this section, we touch upon the startup and shutdown process on Linux. It is beyond the scope of this course to cover this topic in depth and
More informationBooting Up and Shutting Down
Booting Up and Shutting Down Booting Up Starting up a computer Load kernel into memory and execute it. (1) BIOS load and run the MBR (Master Boot Record) (2) MBR searches for the bootable slice (partition)
More informationAdvanced Unix System Administration
Advanced Unix System Administration Lecture 5 February 14, 2007 Steven Luo Shared Libraries The dynamic linker Binaries have a symbol table containing functions, etc. and
More informationRHCE BOOT CAMP. The Boot Process. Wednesday, November 28, 12
RHCE BOOT CAMP The Boot Process OVERVIEW The boot process gets a machine from the useless off state to the feature rich operating system we all know and love Requires cooperation between hardware and software
More informationsystemd: Converting sysvinit scripts
systemd: Converting sysvinit scripts Welcome back for another installment of the systemd series. Throughout this series, we discuss ways to use systemd to understand and manage your system. This article
More informationSystem Administration. Startup Process
System Administration Startup Process Why Care? Every process on your system comes about by following a specific chain of events from the machine startup You may want to disable processes You may want
More informationameh Documentation Release Eric Pierce
ameh Documentation Release 0.0.1 Eric Pierce July 17, 2012 CONTENTS 1 Motivation 3 2 Configuration 5 3 Usage 7 3.1 Permissions................................................ 7 3.2 init....................................................
More informationAuthored by: Brian E. Brzezicki Copyright 2013, Paladin Group LLC Reuse without permission is strictly prohibited
Authored by: Brian E. Brzezicki Copyright 2013, Paladin Group LLC Reuse without permission is strictly prohibited Traditionally Unix systems have used the ATT System V initialization mechanism In System
More informationGetting Started with MySQL
A P P E N D I X B Getting Started with MySQL M ysql is probably the most popular open source database. It is available for Linux and you can download and install it on your Linux machine. The package is
More informationThe Linux IPL Procedure
The Linux IPL Procedure SHARE - Tampa February 13, 2007 Session 9274 Edmund MacKenty Rocket Software, Inc. Purpose De-mystify the Linux boot sequence Explain what happens each step of the way Describe
More informationsimplevisor Documentation
simplevisor Documentation Release 1.2 Massimo Paladin June 27, 2016 Contents 1 Main Features 1 2 Installation 3 3 Configuration 5 4 simplevisor command 9 5 simplevisor-control command 13 6 Supervisor
More informationRunlevels, System Shutdown and Reboot
Information These notes were originally written in the year 2000 as part of a set of LPI Exam 101 training materials. The LPI training course at Bromley College was subsequently discontinued and some of
More informationOPERATING SYSTEMS LINUX
OPERATING SYSTEMS LINUX Božo Krstajić, PhD, University of Montenegro Podgorica bozok@cg.ac.yu Process management Linux operating systems work with processes. Basically a process consists of program code
More informationServices and Security
Services and Security Find out what's listening to the net Find out what services are running Find out what they do Disable or remove any that you don't need References http://techrepublic.com.com/5100-6270-1053043.html
More informationCST8177 Linux II. Linux Boot Process
CST8177 Linux II Linux Boot Process Reference information from the text, http://www.linuxdoc.org and several other web sites Linux Boot Process Topics covered in this slide-set Basic definition of the
More informationProcess Management forks, bombs, zombies, and daemons! Lecture 5, Hands-On Unix System Administration DeCal
Process Management forks, bombs, zombies, and daemons! Lecture 5, Hands-On Unix System Administration DeCal 2012-10-01 what is a process? an abstraction! you can think of it as a program in the midst of
More informationServices, logging, accounting Todd Kelley CST8177 Todd Kelley 1
Services, logging, accounting Todd Kelley kelleyt@algonquincollege.com CST8177 Todd Kelley 1 services syslog logger command line utility psacct lastcomm ac, last, lastlog 2 chkconfig vs service (review)
More informationOpenRC vs rc.d. Compare and contrast
OpenRC vs rc.d Compare and contrast Quick OpenRC FAQ Q. Is OpenRC an init system? Yes - IF you want to use it that way. OpenRC was originally designed only as an rc system. This is how TrueOS uses it,
More informationThe Linux Boot Process
The Linux Boot Process Dr. Billy Harris -- Linux booting -- init/services configuration Copyright 2002 Billy Harris (Billy-Harris@utc.edu) You are welcome to use and distribute this document so long as
More informationChapter 2: Operating-System Structures
Chapter 2: Operating-System Structures Chapter 2: Operating-System Structures Operating System Services User Operating System Interface System Calls Types of System Calls System Programs Operating System
More informationAdvanced Bash Scripting
for HPC SysAdmins Piero Calucci 1 2 1 Scuola Internazionale Superiore di Studi Avanzati Trieste 2 Democritos Modeling Center for Research in Atomistic Simulation INFM November 2008 Advanced School in High
More informationLinux System Administration
System Processes Objective At the conclusion of this module, the student will be able to: Describe and define a process Identify a process ID, the parent process and the child process Learn the PID for
More informationsystemd: What to Know and How to Transition
systemd: What to Know and How to Transition Tom Sorensen Solutions Architect, Red Hat 2 Agenda 4 What is systemd? What does systemd offer? How does this affect me? How do I transition to systemd? What
More informationECE 550D Fundamentals of Computer Systems and Engineering. Fall 2017
ECE 550D Fundamentals of Computer Systems and Engineering Fall 2017 The Operating System (OS) Prof. John Board Duke University Slides are derived from work by Profs. Tyler Bletsch and Andrew Hilton (Duke)
More informationminit Felix von Leitner September 2004 minit
minit Felix von Leitner felix-minit@fefe.de September 2004 minit What is this all about? This talk is about a new init program called minit. Several itches needed scratching: 1. Typical Linux distributions
More informationChapter 2: Operating-System Structures. Operating System Concepts 9 th Edit9on
Chapter 2: Operating-System Structures Operating System Concepts 9 th Edit9on Silberschatz, Galvin and Gagne 2013 Objectives To describe the services an operating system provides to users, processes, and
More informationCHAPTER 2: SYSTEM STRUCTURES. By I-Chen Lin Textbook: Operating System Concepts 9th Ed.
CHAPTER 2: SYSTEM STRUCTURES By I-Chen Lin Textbook: Operating System Concepts 9th Ed. Chapter 2: System Structures Operating System Services User Operating System Interface System Calls Types of System
More informationChapter 2: System Structures. Operating System Concepts 9 th Edition
Chapter 2: System Structures Silberschatz, Galvin and Gagne 2013 Chapter 2: System Structures Operating System Services User Operating System Interface System Calls Types of System Calls System Programs
More informationAdvanced Unix Programming Module 03 Raju Alluri spurthi.com
Advanced Unix Programming Module 03 Raju Alluri askraju @ spurthi.com Advanced Unix Programming: Module 3 Shells & Shell Programming Environment Variables Writing Simple Shell Programs (shell scripts)
More informationNETWORK CONFIGURATION AND SERVICES. route add default gw /etc/init.d/apache restart
NETWORK CONFIGURATION AND SERVICES route add default gw 192.168.0.1 /etc/init.d/apache restart NETWORK CONFIGURATION There are two main approaches to configuring a machine for network access: Static configuration
More informationIntegration of UNICORE Components into Linux Systems
Mitglied der Helmholtz-Gemeinschaft Integration of UNICORE Components into Linux Systems 15.12.2009 Rebecca Breu UNICORE Installation as of Now tgz or graphical installer all files installed into one directory
More informationBasic Shell Commands. Bok, Jong Soon
Basic Shell Commands Bok, Jong Soon javaexpert@nate.com www.javaexpert.co.kr Focusing on Linux Commands These days, many important tasks in Linux can be done from both graphical interfaces and from commands.
More information"Charting the Course... Enterprise Linux System Administration Course Summary
Course Summary Description This is an in-depth course that explores installation, configuration and maintenance of Linux systems. The course focuses on issues universal to every workstation and server.
More informationLecture 5: Jobs and Processes
Lecture 5: and CS2042 - UNIX Tools October 8, 2008 and Lecture Outline 1 2 Manipulating and Intro to Definition: A process is an instance of a running program. More specific than a program because it s
More informationENTERPRISE LINUX SYSTEM ADMINISTRATION
ENTERPRISE LINUX SYSTEM ADMINISTRATION COURSE DESCRIPTION: The GL250 is an in-depth course that explores installation, configuration and maintenance of Linux systems. The course focuses on issues universal
More informationCompTIA Exam LX0-102 Linux Part 2 Version: 10.0 [ Total Questions: 177 ]
s@lm@n CompTIA Exam LX0-102 Linux Part 2 Version: 10.0 [ Total Questions: 177 ] CompTIA LX0-102 : Practice Test Topic break down Topic No. of Questions Topic 1: Volume A 60 Topic 2: Volume B 59 Topic 3:
More informationinit rides the rocket: systemd is here Olaf Kirch
init rides the rocket: systemd is here Olaf Kirch Director SUSE Linux Enterprise okir@suse.com 2 Love it or hate it? 3 1996: Linux Distros adopt SysV-init 4 2001: LSB standardizes init scripts 5 2010:
More informationBooting: ROM vs RAM The term random access memory is somewhat misleading because DRAM, SRAM and ROM all qualify as random access memories We will
Booting Main memory stores the OS The OS needs to be in memory and running for us to be able to start and run other processes Main memory is volatile turn off the power and you lose the contents When you
More informationChapter 2: Operating-System Structures. Operating System Concepts 9 th Edition
Chapter 2: Operating-System Structures Silberschatz, Galvin and Gagne 2013 Chapter 2: Operating-System Structures Operating System Services User Operating System Interface System Calls Types of System
More informationUniversity of Pennsylvania Zachary Goldberg. CIS c. More Kernel Bits. 10/03/09 Slide 1
More Kernel Bits 10/03/09 Slide 1 Rebooting Why would one ever need to reboot on Linux? Installing new driver?... (No) Installing new applications?... (No) Installing new... Anything?... (No) Reconfiguring...
More informationPlease choose the best answer. More than one answer might be true, but choose the one that is best.
Introduction to Linux and Unix - endterm Please choose the best answer. More than one answer might be true, but choose the one that is best. SYSTEM STARTUP 1. A hard disk master boot record is located:
More informationChapter 2. Operating-System Structures
Chapter 2 Operating-System Structures 2.1 Chapter 2: Operating-System Structures Operating System Services User Operating System Interface System Calls Types of System Calls System Programs Operating System
More informationAdvanced Operating Systems and Virtualization. Alessandro Pellegrini A.Y. 2017/2018
Advanced Operating Systems and Virtualization Alessandro Pellegrini A.Y. 2017/2018 Basic Information Lecture Schedule: Course begins today! Course ends on June 1 st Lecture slots: Tuesday, 08.00 am 10.00
More informationInitialization: runlevels
Initialization: init The init process is always the first started (has a PID of 1) and will remain running until the system is shut down With init running, the kernel moves to the background awaiting system
More informationIntroduction to Linux Init Scripts
Introduction to Linux Init Scripts In this session we will cover the Linux initialization process, run levels, how to change the run level and how to initialize a script on login. LAB: http://processors.wiki.ti.com/index.php/sitara_linux_training:_init_scripts
More informationSystem control mechanisms
System control mechanisms David Morgan System control - boot and after passing kernel boot parameters sysconfig: boot process control /proc and sysctrl: tuning kernel config others controlling default
More informationbash Args, Signals, Functions Administrative Shell Scripting COMP2101 Fall 2018
bash Args, Signals, Functions Administrative Shell Scripting COMP2101 Fall 2018 Error Output Failed commands often generate unwanted or irrelevant error messages That output can be saved as a log, sent
More informationWireless Network Access at Swinburne Using FreeBSD 5.3
802.11 Wireless Network Access at Swinburne Using FreeBSD 5.3 CAIA Technical Report 041221A Jason But December 21st, 2004 Introduction FreeBSD is a UNIX oriented operating system which is also the default
More informationBest practices on deployment of IBM Rational. servers
Best practices on deployment of IBM Rational License key server(rlks) on Linux and Unix servers Pankaj Sharma and Sombir Yadav October 21, 2015 Page 1 of 25 INTRODUCTION CONFIGURATION OF LICENSE FILE ON
More informationbash Args, Signals, Functions Administrative Shell Scripting COMP2101 Fall 2017
bash Args, Signals, Functions Administrative Shell Scripting COMP2101 Fall 2017 Positional Arguments It is quite common to allow the user of a script to specify what the script is to operate on (e.g. a
More informationMore on file systems, Booting Todd Kelley CST8177 Todd Kelley 1
More on file systems, Booting Todd Kelley kelleyt@algonquincollege.com CST8177 Todd Kelley 1 bind mounts quotas Booting process and SysVinit Installation Disk rescue mode 2 A bind mount is used to mount
More informationMore Scripting Todd Kelley CST8207 Todd Kelley 1
More Scripting Todd Kelley kelleyt@algonquincollege.com CST8207 Todd Kelley 1 Arithmetic Output with printf Input from a file from a command CST8177 Todd Kelley 2 A script can test whether or not standard
More informationLPI102 EXAM PREPARATION LPIC-1 (LINUX PROFESSIONAL INSTITUTE)
LPI102 EXAM PREPARATION LPIC-1 (LINUX PROFESSIONAL INSTITUTE) COURSE DESCRIPTION: This course prepares students to take the LPI 102 exam of the LPI level 1 certification. The LPI objectives covered are
More informationLPIC 102. be familiar with standard runlevels in a Linux system
LPIC 102 The boot process, init and runlevels 1 Aim After successfully working through this exercise, You will: be familiar with standard runlevels in a Linux system be able to rescue a system without
More informationManual Shell Script Linux If Not Equal String Comparison
Manual Shell Script Linux If Not Equal String Comparison From the Linux ping manual: If mkdir d failed, and returned a non-0 exit code, Bash will skip the next command, and we will stay in the current
More informationUsing grub to Boot various Operating Systems
Operating Systems and Systems Integration Using grub to Boot various Operating Systems Contents 1 Aim 2 2 What You Will Do 2 3 Background 2 3.1 Installing grub in MBR from a floppy, and from the OS........
More informationBasic Linux Security. Roman Bohuk University of Virginia
Basic Linux Security Roman Bohuk University of Virginia What is Linux? An open source operating system Project started by Linus Torvalds kernel Kernel: core program that controls everything else (controls
More informationCS370 Operating Systems
CS370 Operating Systems Colorado State University Yashwant K Malaiya Fall 2016 Lecture 5 Slides based on Text by Silberschatz, Galvin, Gagne Various sources 1 1 User Operating System Interface - CLI CLI
More informationProcesses. CS3026 Operating Systems Lecture 05
Processes CS3026 Operating Systems Lecture 05 Dispatcher Admit Ready Queue Dispatch Processor Release Timeout or Yield Event Occurs Blocked Queue Event Wait Implementation: Using one Ready and one Blocked
More informationManual Script Windows Batch If Statement. Example >>>CLICK HERE<<<
Manual Script Windows Batch If Statement Example Command line interface and Batch Files (PRO and SCRIPTING Editions) Related example batch: Examples/Batch Files starts each time you start Windows and runs
More informationInstallation of Lotus Sametime on SUSE Linux Enterprise Server 10
Installation of Lotus Sametime 8.0.2.1 on SUSE Linux Enterprise Server 10 Maik Weber (maik.weber@de.ibm.com) December 8, 2009 Contents OVERVIEW...3 ABSTRACT...3 REQUIREMENTS...3 INFORMATIONS...4 ICONS...4
More informationCompTIA Linux+/LPIC-1 COPYRIGHTED MATERIAL
CompTIA Linux+/LPIC-1 COPYRIGHTED MATERIAL Chapter System Architecture (Domain 101) THE FOLLOWING COMPTIA LINUX+/LPIC-1 EXAM OBJECTIVES ARE COVERED IN THIS CHAPTER: 101.1 Determine and Configure hardware
More informationChapter 2. UNIX Installation. Node Locked vs Floating Network Licensing. Installation Procedure. Floating Network Keycodes. Node Locked Keycodes.
Chapter 2 UNIX Installation Installation of Artwork Conversion Software s translators and postprocessors on UNIX platforms has been adjusted to make it as similar as possible across the various machines
More informationITDUMPS QUESTION & ANSWER. Accurate study guides, High passing rate! IT dumps provides update free of charge in one year!
ITDUMPS QUESTION & ANSWER Accurate study guides, High passing rate! IT dumps provides update free of charge in one year! HTTP://WWW.ITDUMPS.COM Exam : 1Z0-100 Title : Oracle Linux 5 and 6 System Administration
More informationThe Wonderful World of Services. By: Stefanja
The Wonderful World of Services By: Stefanja What Is a Service? Make the computer world go round Without Services we d have nothing A service is an application that runs in the background to enable a computer
More informationCS420: Operating Systems. OS Services & System Calls
OS Services & System Calls James Moscola Department of Engineering & Computer Science York College of Pennsylvania Based on Operating System Concepts, 9th Edition by Silberschatz, Galvin, Gagne Operating
More informationLinux shell scripting Getting started *
Linux shell scripting Getting started * David Morgan *based on chapter by the same name in Classic Shell Scripting by Robbins and Beebe What s s a script? text file containing commands executed as a unit
More informationSetting up IBM Data Server Manager as a Highly Available Service
Setting up IBM Data Server Manager as a Highly Available Service Version 1.0 March 21 st 2017 Xiao Min Zhao xmzhao@cn.ibm.com Copyright IBM Corporation 2017 IBM Route 100 Somers, NY 10589 Produced in the
More informationElastix Smart Assistant
Elastix Smart Assistant Administrator Manual Objective: Allow the administrator to set up the initial configuration of Smart Assistant in an Elastix server. Description: Smart Assistant is an application
More informationD. Delete the /var/lib/slocate/slocate.db file because it buffers all search results.
Volume: 230 Questions Question No: 1 You located a file created in /home successfully by using the slocate command. You found that the slocate command could locate that file even after deletion. What could
More informationOperating System Services. User Services. System Operation Services. User Operating System Interface - CLI. A View of Operating System Services
Operating System Services One set of services for users The other set of services for system operations Operating Systems Structures Notice: This set of slides is based on the notes by Professor Perrone
More informationMore on file systems, Booting Todd Kelley CST8177 Todd Kelley 1
More on file systems, Booting Todd Kelley kelleyt@algonquincollege.com CST8177 Todd Kelley 1 bind mounts quotas Booting process and SysVinit Installation Disk rescue mode 2 A bind mount is used to mount
More informationOperating Systems. II. Processes
Operating Systems II. Processes Ludovic Apvrille ludovic.apvrille@telecom-paristech.fr Eurecom, office 470 http://soc.eurecom.fr/os/ @OS Eurecom Outline Concepts Definitions and basic concepts Process
More informationUsing BeOS to Ease the Installation, Support and Troubleshooting of Linux on Intel Desktops
BY DAVID GOEKE Using BeOS to Ease the Installation, Support and Troubleshooting of Linux on Intel Desktops I nstalling hardware-dependent Linux, customizing a kernel, and configuring X-Windows on hybrid
More informationLinux Systems Administration Getting Started with Linux
Linux Systems Administration Getting Started with Linux Network Startup Resource Center www.nsrc.org These materials are licensed under the Creative Commons Attribution-NonCommercial 4.0 International
More informationWhy did you do this to me?!
Systemd Why did you do this to me?! 3 1996: Linux Distros adopt SysV-init 2001: LSB standardizes init scripts 2010: Mobile Distros and Parallel Boot... 2027: Still in Good Shape? 4 What's wrong with sysvinit?
More informationOperating System Kernel and the boot process
Operating System Kernel and the Nick Urbanik Copyright Conditions: GNU FDL (seehttp://www.gnu.org/licenses/fdl.html) A computing department I ver. 1.3 Operating System Kernel and Booting
More informationUNIX System Administration
$!... 14:13 $$... 14:13.netrc...12:27-28 /etc/fstab... 6:25 /etc/hosts.equiv... 8:23 /etc/inittab Entries... 4:8 /etc/netmasks... 8:22 /etc/shells... 12:25 /home... 6:69 /tmp...6:61-67 /usr... 6:70 /var...
More informationRHCSA BOOT CAMP. Network Security
RHCSA BOOT CAMP Network Security TCP WRAPPERS TCP Wrappers was originally written to provide host based access control for services which did not already include it. It was one of the first firewalls of
More informationThe kernel is not to be confused with the Basic Input/Output System (BIOS).
Linux Kernel The kernel is the essential center of a computer operating system, the core that provides basic services for all other parts of the operating system. A kernel can be contrasted with a shell,
More informationCSCI 211 UNIX Lab. Shell Programming. Dr. Jiang Li. Jiang Li, Ph.D. Department of Computer Science
CSCI 211 UNIX Lab Shell Programming Dr. Jiang Li Why Shell Scripting Saves a lot of typing A shell script can run many commands at once A shell script can repeatedly run commands Help avoid mistakes Once
More informationHOW LINUX BOOTS. As it turns out, there isn t much to the boot process:
3 HOW LINUX BOOTS You now know the physical structure of a Linux system, what the kernel is, and how to work with processes. This chapter teaches you how the system starts (boots) that is, how the kernel
More informationFour Components of a Computer System
Four Components of a Computer System Operating System Concepts Essentials 2nd Edition 1.1 Silberschatz, Galvin and Gagne 2013 Operating System Definition OS is a resource allocator Manages all resources
More informationTRACE32 Installation... Floating Licenses... 1
Floating Licenses TRACE32 Online Help TRACE32 Directory TRACE32 Index TRACE32 Installation... Floating Licenses... 1 Introduction... 3 TRACE32 Floating License Overview 3 TRACE32 Front-End License as Base
More informationOPERATING SYSTEMS. Božo Krstajić, PhD, University of Montenegro Podgorica.
OPERATING SYSTEMS Božo Krstajić, PhD, University of Montenegro Podgorica bozok@cg.ac.yu 1 The /etc/rc.d directory The system initialization files are stored in the /etc/rc.d directory. Each task or runlevel
More informationHow to stop / start services in boot time and install / remove / update SuSE SLES (Suse Enterprise Linux Server)?
How to stop / start services in boot time and install / remove / update SuSE SLES (Suse Enterprise Linux Server)? Author : admin If you're long time Linux sysadmin but you haven't need to adminster SuSE
More informationChapter 2: Operating-System Structures. Operating System Concepts Essentials 8 th Edition
Chapter 2: Operating-System Structures Operating System Concepts Essentials 8 th Edition Silberschatz, Galvin and Gagne 2011 Chapter 2: Operating-System Structures Operating System Services User Operating
More informationThe Early System Start-Up Process. Group Presentation by: Tianyuan Liu, Caiwei He, Krishna Parasuram Srinivasan, Wenbin Xu
The Early System Start-Up Process Group Presentation by: Tianyuan Liu, Caiwei He, Krishna Parasuram Srinivasan, Wenbin Xu 1 Boot Process Booting is the initialization of a computerized system In Linux,
More informationChapter 2: System Structures. Operating System Concepts 9 th Edition
Chapter 2: System Structures Silberschatz, Galvin and Gagne 2013 Chapter 2: System Structures Operating System Services User Operating System Interface System Calls Types of System Calls System Programs
More informationManual Shell Script Linux If File Exists And
Manual Shell Script Linux If File Exists And Is Not Empty read Bash Conditional Expressions in the manual, and use the -r and -w operators glenn jackman Dec 10 '14 at -s FILE True if file exists and is
More informationUsers Manual. OP5 System 2.4. OP5 AB. Page 1 of 6
Users Manual OP5 System 2.4 OP5 AB. Page 1 of 6 Table of Contents INTRODUCTION...3 FUNDAMENTALS...3 SYSTEM...3 ACCESS...3 ACCOUNTS...3 CONFIGURATION...4 NETWORK...4 SHUTDOWN...4 SERVICES...5 UPGRADE /
More informationStart Up and Shutdown Procedures (Unix)
Start Up and Shutdown Procedures (Unix) Start Up On Main Console 1. Press the Server main power button ON 2. The system will automatically go through the start-up procedures, which will be displayed on
More informationChapter 2: Operating-System
Chapter 2: Operating-System Structures Chapter 2: Operating-System Structures Operating System Services! User Operating System Interface! System Calls! Types of System Calls! System Programs! Operating
More information